Seguing ever so slightly for a moment. I managed to get close-ups of the diffuser on the RB7 and the MP4-26 after visiting the Autosport Racing show yesterday, after security guard lowered the barrier for me. If the MP4-26's EBD was a copy of the RB7, then it was not a very good one, as to my untrained eyes they looked totally different. Further though it pains me to admit it, the the RB7's sculpturing of the exhaust tail-pipe into the bodywork pre-diffuser to enerfise their EBD looked far more precise than the '26.
MP4-26
RB7
Apologies for image quality, crackberry after-all!
sAx